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[deliverable/binutils-gdb.git] / bfd / elf32-m68hc11.c
1 /* Motorola 68HC11-specific support for 32-bit ELF
2 Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3 Contributed by Stephane Carrez (stcarrez@nerim.fr)
4 (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22 #include "bfd.h"
23 #include "sysdep.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/m68hc11.h"
28
29 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void m68hc11_info_to_howto_rel
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33
34 static bfd_reloc_status_type m68hc11_elf_ignore_reloc
35 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
36
37 /* GC mark and sweep. */
38 static asection *elf32_m68hc11_gc_mark_hook
39 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
40 struct elf_link_hash_entry *, Elf_Internal_Sym *));
41 static bfd_boolean elf32_m68hc11_gc_sweep_hook
42 PARAMS ((bfd *, struct bfd_link_info *, asection *,
43 const Elf_Internal_Rela *));
44 static bfd_boolean elf32_m68hc11_check_relocs
45 PARAMS ((bfd *, struct bfd_link_info *, asection *,
46 const Elf_Internal_Rela *));
47 static bfd_boolean elf32_m68hc11_relocate_section
48 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
49 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
50 static bfd_boolean m68hc11_elf_relax_section
51 PARAMS ((bfd *, asection *, struct bfd_link_info *, bfd_boolean *));
52 static void m68hc11_elf_relax_delete_bytes
53 PARAMS ((bfd *, asection *, bfd_vma, int));
54 static void m68hc11_relax_group
55 PARAMS ((bfd *, asection *, bfd_byte *, unsigned,
56 unsigned long, unsigned long));
57 static int compare_reloc PARAMS ((const void *, const void *));
58
59
60 bfd_boolean _bfd_m68hc11_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
61 bfd_boolean _bfd_m68hc11_elf_set_private_flags PARAMS ((bfd *, flagword));
62 bfd_boolean _bfd_m68hc11_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
63
64 /* Use REL instead of RELA to save space */
65 #define USE_REL 1
66
67 /* The Motorola 68HC11 microcontroler only addresses 64Kb.
68 We must handle 8 and 16-bit relocations. The 32-bit relocation
69 is defined but not used except by gas when -gstabs is used (which
70 is wrong).
71 The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */
72 static reloc_howto_type elf_m68hc11_howto_table[] = {
73 /* This reloc does nothing. */
74 HOWTO (R_M68HC11_NONE, /* type */
75 0, /* rightshift */
76 2, /* size (0 = byte, 1 = short, 2 = long) */
77 32, /* bitsize */
78 FALSE, /* pc_relative */
79 0, /* bitpos */
80 complain_overflow_dont,/* complain_on_overflow */
81 bfd_elf_generic_reloc, /* special_function */
82 "R_M68HC11_NONE", /* name */
83 FALSE, /* partial_inplace */
84 0, /* src_mask */
85 0, /* dst_mask */
86 FALSE), /* pcrel_offset */
87
88 /* A 8 bit absolute relocation */
89 HOWTO (R_M68HC11_8, /* type */
90 0, /* rightshift */
91 0, /* size (0 = byte, 1 = short, 2 = long) */
92 8, /* bitsize */
93 FALSE, /* pc_relative */
94 0, /* bitpos */
95 complain_overflow_bitfield, /* complain_on_overflow */
96 bfd_elf_generic_reloc, /* special_function */
97 "R_M68HC11_8", /* name */
98 FALSE, /* partial_inplace */
99 0x00ff, /* src_mask */
100 0x00ff, /* dst_mask */
101 FALSE), /* pcrel_offset */
102
103 /* A 8 bit absolute relocation (upper address) */
104 HOWTO (R_M68HC11_HI8, /* type */
105 8, /* rightshift */
106 0, /* size (0 = byte, 1 = short, 2 = long) */
107 8, /* bitsize */
108 FALSE, /* pc_relative */
109 0, /* bitpos */
110 complain_overflow_bitfield, /* complain_on_overflow */
111 bfd_elf_generic_reloc, /* special_function */
112 "R_M68HC11_HI8", /* name */
113 FALSE, /* partial_inplace */
114 0x00ff, /* src_mask */
115 0x00ff, /* dst_mask */
116 FALSE), /* pcrel_offset */
117
118 /* A 8 bit absolute relocation (upper address) */
119 HOWTO (R_M68HC11_LO8, /* type */
120 0, /* rightshift */
121 0, /* size (0 = byte, 1 = short, 2 = long) */
122 8, /* bitsize */
123 FALSE, /* pc_relative */
124 0, /* bitpos */
125 complain_overflow_dont, /* complain_on_overflow */
126 bfd_elf_generic_reloc, /* special_function */
127 "R_M68HC11_LO8", /* name */
128 FALSE, /* partial_inplace */
129 0x00ff, /* src_mask */
130 0x00ff, /* dst_mask */
131 FALSE), /* pcrel_offset */
132
133 /* A 8 bit PC-rel relocation */
134 HOWTO (R_M68HC11_PCREL_8, /* type */
135 0, /* rightshift */
136 0, /* size (0 = byte, 1 = short, 2 = long) */
137 8, /* bitsize */
138 TRUE, /* pc_relative */
139 0, /* bitpos */
140 complain_overflow_bitfield, /* complain_on_overflow */
141 bfd_elf_generic_reloc, /* special_function */
142 "R_M68HC11_PCREL_8", /* name */
143 FALSE, /* partial_inplace */
144 0x00ff, /* src_mask */
145 0x00ff, /* dst_mask */
146 FALSE), /* pcrel_offset */
147
148 /* A 16 bit absolute relocation */
149 HOWTO (R_M68HC11_16, /* type */
150 0, /* rightshift */
151 1, /* size (0 = byte, 1 = short, 2 = long) */
152 16, /* bitsize */
153 FALSE, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
156 bfd_elf_generic_reloc, /* special_function */
157 "R_M68HC11_16", /* name */
158 FALSE, /* partial_inplace */
159 0xffff, /* src_mask */
160 0xffff, /* dst_mask */
161 FALSE), /* pcrel_offset */
162
163 /* A 32 bit absolute relocation. This one is never used for the
164 code relocation. It's used by gas for -gstabs generation. */
165 HOWTO (R_M68HC11_32, /* type */
166 0, /* rightshift */
167 2, /* size (0 = byte, 1 = short, 2 = long) */
168 32, /* bitsize */
169 FALSE, /* pc_relative */
170 0, /* bitpos */
171 complain_overflow_bitfield, /* complain_on_overflow */
172 bfd_elf_generic_reloc, /* special_function */
173 "R_M68HC11_32", /* name */
174 FALSE, /* partial_inplace */
175 0xffffffff, /* src_mask */
176 0xffffffff, /* dst_mask */
177 FALSE), /* pcrel_offset */
178
179 /* A 3 bit absolute relocation */
180 HOWTO (R_M68HC11_3B, /* type */
181 0, /* rightshift */
182 0, /* size (0 = byte, 1 = short, 2 = long) */
183 3, /* bitsize */
184 FALSE, /* pc_relative */
185 0, /* bitpos */
186 complain_overflow_bitfield, /* complain_on_overflow */
187 bfd_elf_generic_reloc, /* special_function */
188 "R_M68HC11_4B", /* name */
189 FALSE, /* partial_inplace */
190 0x003, /* src_mask */
191 0x003, /* dst_mask */
192 FALSE), /* pcrel_offset */
193
194 /* A 16 bit PC-rel relocation */
195 HOWTO (R_M68HC11_PCREL_16, /* type */
196 0, /* rightshift */
197 1, /* size (0 = byte, 1 = short, 2 = long) */
198 16, /* bitsize */
199 TRUE, /* pc_relative */
200 0, /* bitpos */
201 complain_overflow_dont, /* complain_on_overflow */
202 bfd_elf_generic_reloc, /* special_function */
203 "R_M68HC11_PCREL_16", /* name */
204 FALSE, /* partial_inplace */
205 0xffff, /* src_mask */
206 0xffff, /* dst_mask */
207 FALSE), /* pcrel_offset */
208
209 /* GNU extension to record C++ vtable hierarchy */
210 HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */
211 0, /* rightshift */
212 1, /* size (0 = byte, 1 = short, 2 = long) */
213 0, /* bitsize */
214 FALSE, /* pc_relative */
215 0, /* bitpos */
216 complain_overflow_dont, /* complain_on_overflow */
217 NULL, /* special_function */
218 "R_M68HC11_GNU_VTINHERIT", /* name */
219 FALSE, /* partial_inplace */
220 0, /* src_mask */
221 0, /* dst_mask */
222 FALSE), /* pcrel_offset */
223
224 /* GNU extension to record C++ vtable member usage */
225 HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
226 0, /* rightshift */
227 1, /* size (0 = byte, 1 = short, 2 = long) */
228 0, /* bitsize */
229 FALSE, /* pc_relative */
230 0, /* bitpos */
231 complain_overflow_dont, /* complain_on_overflow */
232 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
233 "R_M68HC11_GNU_VTENTRY", /* name */
234 FALSE, /* partial_inplace */
235 0, /* src_mask */
236 0, /* dst_mask */
237 FALSE), /* pcrel_offset */
238
239 /* A 24 bit relocation */
240 HOWTO (R_M68HC11_24, /* type */
241 0, /* rightshift */
242 1, /* size (0 = byte, 1 = short, 2 = long) */
243 24, /* bitsize */
244 FALSE, /* pc_relative */
245 0, /* bitpos */
246 complain_overflow_bitfield, /* complain_on_overflow */
247 bfd_elf_generic_reloc, /* special_function */
248 "R_M68HC11_24", /* name */
249 FALSE, /* partial_inplace */
250 0xffff, /* src_mask */
251 0xffff, /* dst_mask */
252 FALSE), /* pcrel_offset */
253
254 /* A 16-bit low relocation */
255 HOWTO (R_M68HC11_LO16, /* type */
256 0, /* rightshift */
257 1, /* size (0 = byte, 1 = short, 2 = long) */
258 16, /* bitsize */
259 FALSE, /* pc_relative */
260 0, /* bitpos */
261 complain_overflow_bitfield, /* complain_on_overflow */
262 bfd_elf_generic_reloc, /* special_function */
263 "R_M68HC11_LO16", /* name */
264 FALSE, /* partial_inplace */
265 0xffff, /* src_mask */
266 0xffff, /* dst_mask */
267 FALSE), /* pcrel_offset */
268
269 /* A page relocation */
270 HOWTO (R_M68HC11_PAGE, /* type */
271 0, /* rightshift */
272 0, /* size (0 = byte, 1 = short, 2 = long) */
273 8, /* bitsize */
274 FALSE, /* pc_relative */
275 0, /* bitpos */
276 complain_overflow_bitfield, /* complain_on_overflow */
277 bfd_elf_generic_reloc, /* special_function */
278 "R_M68HC11_PAGE", /* name */
279 FALSE, /* partial_inplace */
280 0x00ff, /* src_mask */
281 0x00ff, /* dst_mask */
282 FALSE), /* pcrel_offset */
283
284 EMPTY_HOWTO (14),
285 EMPTY_HOWTO (15),
286 EMPTY_HOWTO (16),
287 EMPTY_HOWTO (17),
288 EMPTY_HOWTO (18),
289 EMPTY_HOWTO (19),
290
291 /* Mark beginning of a jump instruction (any form). */
292 HOWTO (R_M68HC11_RL_JUMP, /* type */
293 0, /* rightshift */
294 1, /* size (0 = byte, 1 = short, 2 = long) */
295 0, /* bitsize */
296 FALSE, /* pc_relative */
297 0, /* bitpos */
298 complain_overflow_dont, /* complain_on_overflow */
299 m68hc11_elf_ignore_reloc, /* special_function */
300 "R_M68HC11_RL_JUMP", /* name */
301 TRUE, /* partial_inplace */
302 0, /* src_mask */
303 0, /* dst_mask */
304 TRUE), /* pcrel_offset */
305
306 /* Mark beginning of Gcc relaxation group instruction. */
307 HOWTO (R_M68HC11_RL_GROUP, /* type */
308 0, /* rightshift */
309 1, /* size (0 = byte, 1 = short, 2 = long) */
310 0, /* bitsize */
311 FALSE, /* pc_relative */
312 0, /* bitpos */
313 complain_overflow_dont, /* complain_on_overflow */
314 m68hc11_elf_ignore_reloc, /* special_function */
315 "R_M68HC11_RL_GROUP", /* name */
316 TRUE, /* partial_inplace */
317 0, /* src_mask */
318 0, /* dst_mask */
319 TRUE), /* pcrel_offset */
320 };
321
322 /* Map BFD reloc types to M68HC11 ELF reloc types. */
323
324 struct m68hc11_reloc_map
325 {
326 bfd_reloc_code_real_type bfd_reloc_val;
327 unsigned char elf_reloc_val;
328 };
329
330 static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
331 {BFD_RELOC_NONE, R_M68HC11_NONE,},
332 {BFD_RELOC_8, R_M68HC11_8},
333 {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
334 {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
335 {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
336 {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
337 {BFD_RELOC_16, R_M68HC11_16},
338 {BFD_RELOC_32, R_M68HC11_32},
339 {BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
340
341 {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
342 {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
343
344 {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
345 {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
346 {BFD_RELOC_M68HC11_24, R_M68HC11_24},
347
348 {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
349 {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
350 };
351
352 static reloc_howto_type *
353 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
354 bfd *abfd ATTRIBUTE_UNUSED;
355 bfd_reloc_code_real_type code;
356 {
357 unsigned int i;
358
359 for (i = 0;
360 i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
361 i++)
362 {
363 if (m68hc11_reloc_map[i].bfd_reloc_val == code)
364 return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
365 }
366
367 return NULL;
368 }
369
370 /* This function is used for relocs which are only used for relaxing,
371 which the linker should otherwise ignore. */
372
373 static bfd_reloc_status_type
374 m68hc11_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section,
375 output_bfd, error_message)
376 bfd *abfd ATTRIBUTE_UNUSED;
377 arelent *reloc_entry;
378 asymbol *symbol ATTRIBUTE_UNUSED;
379 PTR data ATTRIBUTE_UNUSED;
380 asection *input_section;
381 bfd *output_bfd;
382 char **error_message ATTRIBUTE_UNUSED;
383 {
384 if (output_bfd != NULL)
385 reloc_entry->address += input_section->output_offset;
386 return bfd_reloc_ok;
387 }
388
389 /* Set the howto pointer for an M68HC11 ELF reloc. */
390
391 static void
392 m68hc11_info_to_howto_rel (abfd, cache_ptr, dst)
393 bfd *abfd ATTRIBUTE_UNUSED;
394 arelent *cache_ptr;
395 Elf_Internal_Rela *dst;
396 {
397 unsigned int r_type;
398
399 r_type = ELF32_R_TYPE (dst->r_info);
400 BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
401 cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
402 }
403
404 static asection *
405 elf32_m68hc11_gc_mark_hook (sec, info, rel, h, sym)
406 asection *sec;
407 struct bfd_link_info *info ATTRIBUTE_UNUSED;
408 Elf_Internal_Rela *rel;
409 struct elf_link_hash_entry *h;
410 Elf_Internal_Sym *sym;
411 {
412 if (h != NULL)
413 {
414 switch (ELF32_R_TYPE (rel->r_info))
415 {
416 default:
417 switch (h->root.type)
418 {
419 case bfd_link_hash_defined:
420 case bfd_link_hash_defweak:
421 return h->root.u.def.section;
422
423 case bfd_link_hash_common:
424 return h->root.u.c.p->section;
425
426 default:
427 break;
428 }
429 }
430 }
431 else
432 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
433
434 return NULL;
435 }
436
437 static bfd_boolean
438 elf32_m68hc11_gc_sweep_hook (abfd, info, sec, relocs)
439 bfd *abfd ATTRIBUTE_UNUSED;
440 struct bfd_link_info *info ATTRIBUTE_UNUSED;
441 asection *sec ATTRIBUTE_UNUSED;
442 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
443 {
444 /* We don't use got and plt entries for 68hc11/68hc12. */
445 return TRUE;
446 }
447
448 struct m68hc11_direct_relax
449 {
450 const char *name;
451 unsigned char code;
452 unsigned char direct_code;
453 } m68hc11_direct_relax_table[] = {
454 { "adca", 0xB9, 0x99 },
455 { "adcb", 0xF9, 0xD9 },
456 { "adda", 0xBB, 0x9B },
457 { "addb", 0xFB, 0xDB },
458 { "addd", 0xF3, 0xD3 },
459 { "anda", 0xB4, 0x94 },
460 { "andb", 0xF4, 0xD4 },
461 { "cmpa", 0xB1, 0x91 },
462 { "cmpb", 0xF1, 0xD1 },
463 { "cpd", 0xB3, 0x93 },
464 { "cpxy", 0xBC, 0x9C },
465 /* { "cpy", 0xBC, 0x9C }, */
466 { "eora", 0xB8, 0x98 },
467 { "eorb", 0xF8, 0xD8 },
468 { "jsr", 0xBD, 0x9D },
469 { "ldaa", 0xB6, 0x96 },
470 { "ldab", 0xF6, 0xD6 },
471 { "ldd", 0xFC, 0xDC },
472 { "lds", 0xBE, 0x9E },
473 { "ldxy", 0xFE, 0xDE },
474 /* { "ldy", 0xFE, 0xDE },*/
475 { "oraa", 0xBA, 0x9A },
476 { "orab", 0xFA, 0xDA },
477 { "sbca", 0xB2, 0x92 },
478 { "sbcb", 0xF2, 0xD2 },
479 { "staa", 0xB7, 0x97 },
480 { "stab", 0xF7, 0xD7 },
481 { "std", 0xFD, 0xDD },
482 { "sts", 0xBF, 0x9F },
483 { "stxy", 0xFF, 0xDF },
484 /* { "sty", 0xFF, 0xDF },*/
485 { "suba", 0xB0, 0x90 },
486 { "subb", 0xF0, 0xD0 },
487 { "subd", 0xB3, 0x93 },
488 { 0, 0, 0 }
489 };
490
491 static struct m68hc11_direct_relax *
492 find_relaxable_insn (unsigned char code)
493 {
494 int i;
495
496 for (i = 0; m68hc11_direct_relax_table[i].name; i++)
497 if (m68hc11_direct_relax_table[i].code == code)
498 return &m68hc11_direct_relax_table[i];
499
500 return 0;
501 }
502
503 static int
504 compare_reloc (e1, e2)
505 const void *e1;
506 const void *e2;
507 {
508 const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1;
509 const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2;
510
511 if (i1->r_offset == i2->r_offset)
512 return 0;
513 else
514 return i1->r_offset < i2->r_offset ? -1 : 1;
515 }
516
517 #define M6811_OP_LDX_IMMEDIATE (0xCE)
518
519 static void
520 m68hc11_relax_group (abfd, sec, contents, value, offset, end_group)
521 bfd *abfd;
522 asection *sec;
523 bfd_byte *contents;
524 unsigned value;
525 unsigned long offset;
526 unsigned long end_group;
527 {
528 unsigned char code;
529 unsigned long start_offset;
530 unsigned long ldx_offset = offset;
531 unsigned long ldx_size;
532 int can_delete_ldx;
533 int relax_ldy = 0;
534
535 /* First instruction of the relax group must be a
536 LDX #value or LDY #value. If this is not the case,
537 ignore the relax group. */
538 code = bfd_get_8 (abfd, contents + offset);
539 if (code == 0x18)
540 {
541 relax_ldy++;
542 offset++;
543 code = bfd_get_8 (abfd, contents + offset);
544 }
545 ldx_size = offset - ldx_offset + 3;
546 offset += 3;
547 if (code != M6811_OP_LDX_IMMEDIATE || offset >= end_group)
548 return;
549
550
551 /* We can remove the LDX/LDY only when all bset/brclr instructions
552 of the relax group have been converted to use direct addressing
553 mode. */
554 can_delete_ldx = 1;
555 while (offset < end_group)
556 {
557 unsigned isize;
558 unsigned new_value;
559 int bset_use_y;
560
561 bset_use_y = 0;
562 start_offset = offset;
563 code = bfd_get_8 (abfd, contents + offset);
564 if (code == 0x18)
565 {
566 bset_use_y++;
567 offset++;
568 code = bfd_get_8 (abfd, contents + offset);
569 }
570
571 /* Check the instruction and translate to use direct addressing mode. */
572 switch (code)
573 {
574 /* bset */
575 case 0x1C:
576 code = 0x14;
577 isize = 3;
578 break;
579
580 /* brclr */
581 case 0x1F:
582 code = 0x13;
583 isize = 4;
584 break;
585
586 /* brset */
587 case 0x1E:
588 code = 0x12;
589 isize = 4;
590 break;
591
592 /* bclr */
593 case 0x1D:
594 code = 0x15;
595 isize = 3;
596 break;
597
598 /* This instruction is not recognized and we are not
599 at end of the relax group. Ignore and don't remove
600 the first LDX (we don't know what it is used for...). */
601 default:
602 return;
603 }
604 new_value = (unsigned) bfd_get_8 (abfd, contents + offset + 1);
605 new_value += value;
606 if ((new_value & 0xff00) == 0 && bset_use_y == relax_ldy)
607 {
608 bfd_put_8 (abfd, code, contents + offset);
609 bfd_put_8 (abfd, new_value, contents + offset + 1);
610 if (start_offset != offset)
611 {
612 m68hc11_elf_relax_delete_bytes (abfd, sec, start_offset,
613 offset - start_offset);
614 end_group--;
615 }
616 }
617 else
618 {
619 can_delete_ldx = 0;
620 }
621 offset = start_offset + isize;
622 }
623 if (can_delete_ldx)
624 {
625 /* Remove the move instruction (3 or 4 bytes win). */
626 m68hc11_elf_relax_delete_bytes (abfd, sec, ldx_offset, ldx_size);
627 }
628 }
629
630 /* This function handles relaxing for the 68HC11.
631
632
633 and somewhat more difficult to support. */
634
635 static bfd_boolean
636 m68hc11_elf_relax_section (abfd, sec, link_info, again)
637 bfd *abfd;
638 asection *sec;
639 struct bfd_link_info *link_info;
640 bfd_boolean *again;
641 {
642 Elf_Internal_Shdr *symtab_hdr;
643 Elf_Internal_Shdr *shndx_hdr;
644 Elf_Internal_Rela *internal_relocs;
645 Elf_Internal_Rela *free_relocs = NULL;
646 Elf_Internal_Rela *irel, *irelend;
647 bfd_byte *contents = NULL;
648 bfd_byte *free_contents = NULL;
649 Elf32_External_Sym *free_extsyms = NULL;
650 Elf_Internal_Rela *prev_insn_branch = NULL;
651 Elf_Internal_Rela *prev_insn_group = NULL;
652 unsigned insn_group_value = 0;
653 Elf_Internal_Sym *isymbuf = NULL;
654
655 /* Assume nothing changes. */
656 *again = FALSE;
657
658 /* We don't have to do anything for a relocateable link, if
659 this section does not have relocs, or if this is not a
660 code section. */
661 if (link_info->relocateable
662 || (sec->flags & SEC_RELOC) == 0
663 || sec->reloc_count == 0
664 || (sec->flags & SEC_CODE) == 0)
665 return TRUE;
666
667 /* If this is the first time we have been called for this section,
668 initialize the cooked size. */
669 if (sec->_cooked_size == 0)
670 sec->_cooked_size = sec->_raw_size;
671
672 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
673 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
674
675 /* Get a copy of the native relocations. */
676 internal_relocs = (_bfd_elf32_link_read_relocs
677 (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
678 link_info->keep_memory));
679 if (internal_relocs == NULL)
680 goto error_return;
681 if (! link_info->keep_memory)
682 free_relocs = internal_relocs;
683
684 /* Checking for branch relaxation relies on the relocations to
685 be sorted on 'r_offset'. This is not guaranteed so we must sort. */
686 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
687 compare_reloc);
688
689 /* Walk through them looking for relaxing opportunities. */
690 irelend = internal_relocs + sec->reloc_count;
691 for (irel = internal_relocs; irel < irelend; irel++)
692 {
693 bfd_vma symval;
694 bfd_vma value;
695 Elf_Internal_Sym *isym;
696 asection *sym_sec;
697
698 /* If this isn't something that can be relaxed, then ignore
699 this reloc. */
700 if (ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_16
701 && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_JUMP
702 && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_GROUP)
703 {
704 prev_insn_branch = 0;
705 prev_insn_group = 0;
706 continue;
707 }
708
709 /* Get the section contents if we haven't done so already. */
710 if (contents == NULL)
711 {
712 /* Get cached copy if it exists. */
713 if (elf_section_data (sec)->this_hdr.contents != NULL)
714 contents = elf_section_data (sec)->this_hdr.contents;
715 else
716 {
717 /* Go get them off disk. */
718 contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
719 if (contents == NULL)
720 goto error_return;
721 free_contents = contents;
722
723 if (! bfd_get_section_contents (abfd, sec, contents,
724 (file_ptr) 0, sec->_raw_size))
725 goto error_return;
726 }
727 }
728
729 /* Try to eliminate an unconditional 8 bit pc-relative branch
730 which immediately follows a conditional 8 bit pc-relative
731 branch around the unconditional branch.
732
733 original: new:
734 bCC lab1 bCC' lab2
735 bra lab2
736 lab1: lab1:
737
738 This happens when the bCC can't reach lab2 at assembly time,
739 but due to other relaxations it can reach at link time. */
740 if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_JUMP)
741 {
742 Elf_Internal_Rela *nrel;
743 unsigned char code;
744 unsigned char roffset;
745
746 prev_insn_branch = 0;
747 prev_insn_group = 0;
748
749 /* Do nothing if this reloc is the last byte in the section. */
750 if (irel->r_offset == sec->_cooked_size)
751 continue;
752
753 /* See if the next instruction is an unconditional pc-relative
754 branch, more often than not this test will fail, so we
755 test it first to speed things up. */
756 code = bfd_get_8 (abfd, contents + irel->r_offset + 2);
757 if (code != 0x7e)
758 continue;
759
760 /* Also make sure the next relocation applies to the next
761 instruction and that it's a pc-relative 8 bit branch. */
762 nrel = irel + 1;
763 if (nrel == irelend
764 || irel->r_offset + 3 != nrel->r_offset
765 || ELF32_R_TYPE (nrel->r_info) != (int) R_M68HC11_16)
766 continue;
767
768 /* Make sure our destination immediately follows the
769 unconditional branch. */
770 roffset = bfd_get_8 (abfd, contents + irel->r_offset + 1);
771 if (roffset != 3)
772 continue;
773
774 prev_insn_branch = irel;
775 prev_insn_group = 0;
776 continue;
777 }
778
779 /* Read this BFD's symbols if we haven't done so already. */
780 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
781 {
782 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
783 if (isymbuf == NULL)
784 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
785 symtab_hdr->sh_info, 0,
786 NULL, NULL, NULL);
787 if (isymbuf == NULL)
788 goto error_return;
789 }
790
791 /* Get the value of the symbol referred to by the reloc. */
792 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
793 {
794 /* A local symbol. */
795 isym = isymbuf + ELF32_R_SYM (irel->r_info);
796 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
797 symval = (isym->st_value
798 + sym_sec->output_section->vma
799 + sym_sec->output_offset);
800 }
801 else
802 {
803 unsigned long indx;
804 struct elf_link_hash_entry *h;
805
806 /* An external symbol. */
807 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
808 h = elf_sym_hashes (abfd)[indx];
809 BFD_ASSERT (h != NULL);
810 if (h->root.type != bfd_link_hash_defined
811 && h->root.type != bfd_link_hash_defweak)
812 {
813 /* This appears to be a reference to an undefined
814 symbol. Just ignore it--it will be caught by the
815 regular reloc processing. */
816 prev_insn_branch = 0;
817 prev_insn_group = 0;
818 continue;
819 }
820
821 isym = 0;
822 sym_sec = h->root.u.def.section;
823 symval = (h->root.u.def.value
824 + sym_sec->output_section->vma
825 + sym_sec->output_offset);
826 }
827
828 if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_GROUP)
829 {
830 prev_insn_branch = 0;
831 prev_insn_group = 0;
832
833 /* Do nothing if this reloc is the last byte in the section. */
834 if (irel->r_offset == sec->_cooked_size)
835 continue;
836
837 prev_insn_group = irel;
838 insn_group_value = isym->st_value;
839 continue;
840 }
841
842 /* When we relax some bytes, the size of our section changes.
843 This affects the layout of next input sections that go in our
844 output section. When the symbol is part of another section that
845 will go in the same output section as the current one, it's
846 final address may now be incorrect (too far). We must let the
847 linker re-compute all section offsets before processing this
848 reloc. Code example:
849
850 Initial Final
851 .sect .text section size = 6 section size = 4
852 jmp foo
853 jmp bar
854 .sect .text.foo_bar output_offset = 6 output_offset = 4
855 foo: rts
856 bar: rts
857
858 If we process the reloc now, the jmp bar is replaced by a
859 relative branch to the initial bar address (output_offset 6). */
860 if (*again && sym_sec != sec
861 && sym_sec->output_section == sec->output_section)
862 {
863 prev_insn_group = 0;
864 prev_insn_branch = 0;
865 continue;
866 }
867
868 value = symval;
869 /* Try to turn a far branch to a near branch. */
870 if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16
871 && prev_insn_branch)
872 {
873 bfd_vma offset;
874 unsigned char code;
875
876 offset = value - (prev_insn_branch->r_offset
877 + sec->output_section->vma
878 + sec->output_offset + 2);
879
880 /* If the offset is still out of -128..+127 range,
881 leave that far branch unchanged. */
882 if ((offset & 0xff80) != 0 && (offset & 0xff80) != 0xff80)
883 {
884 prev_insn_branch = 0;
885 continue;
886 }
887
888 /* Shrink the branch. */
889 code = bfd_get_8 (abfd, contents + prev_insn_branch->r_offset);
890 if (code == 0x7e)
891 {
892 code = 0x20;
893 bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset);
894 bfd_put_8 (abfd, offset,
895 contents + prev_insn_branch->r_offset + 1);
896 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
897 R_M68HC11_NONE);
898 m68hc11_elf_relax_delete_bytes (abfd, sec,
899 irel->r_offset, 1);
900 }
901 else
902 {
903 code ^= 0x1;
904 bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset);
905 bfd_put_8 (abfd, offset,
906 contents + prev_insn_branch->r_offset + 1);
907 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
908 R_M68HC11_NONE);
909 m68hc11_elf_relax_delete_bytes (abfd, sec,
910 irel->r_offset - 1, 3);
911 }
912 prev_insn_branch = 0;
913 *again = TRUE;
914 }
915
916 /* Try to turn a 16 bit address into a 8 bit page0 address. */
917 else if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16
918 && (value & 0xff00) == 0)
919 {
920 unsigned char code;
921 unsigned short offset;
922 struct m68hc11_direct_relax *rinfo;
923
924 prev_insn_branch = 0;
925 offset = bfd_get_16 (abfd, contents + irel->r_offset);
926 offset += value;
927 if ((offset & 0xff00) != 0)
928 {
929 prev_insn_group = 0;
930 continue;
931 }
932
933 if (prev_insn_group)
934 {
935 unsigned long old_sec_size = sec->_cooked_size;
936
937 /* Note that we've changed the reldection contents, etc. */
938 elf_section_data (sec)->relocs = internal_relocs;
939 free_relocs = NULL;
940
941 elf_section_data (sec)->this_hdr.contents = contents;
942 free_contents = NULL;
943
944 symtab_hdr->contents = (bfd_byte *) isymbuf;
945 free_extsyms = NULL;
946
947 m68hc11_relax_group (abfd, sec, contents, offset,
948 prev_insn_group->r_offset,
949 insn_group_value);
950 irel = prev_insn_group;
951 prev_insn_group = 0;
952 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
953 R_M68HC11_NONE);
954 if (sec->_cooked_size != old_sec_size)
955 *again = TRUE;
956 continue;
957 }
958
959 /* Get the opcode. */
960 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
961 rinfo = find_relaxable_insn (code);
962 if (rinfo == 0)
963 {
964 prev_insn_group = 0;
965 continue;
966 }
967
968 /* Note that we've changed the reldection contents, etc. */
969 elf_section_data (sec)->relocs = internal_relocs;
970 free_relocs = NULL;
971
972 elf_section_data (sec)->this_hdr.contents = contents;
973 free_contents = NULL;
974
975 symtab_hdr->contents = (bfd_byte *) isymbuf;
976 free_extsyms = NULL;
977
978 /* Fix the opcode. */
979 /* printf ("A relaxable case : 0x%02x (%s)\n",
980 code, rinfo->name); */
981 bfd_put_8 (abfd, rinfo->direct_code,
982 contents + irel->r_offset - 1);
983
984 /* Delete one byte of data (upper byte of address). */
985 m68hc11_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 1);
986
987 /* Fix the relocation's type. */
988 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
989 R_M68HC11_8);
990
991 /* That will change things, so, we should relax again. */
992 *again = TRUE;
993 }
994 else if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_16)
995 {
996 unsigned char code;
997 bfd_vma offset;
998
999 prev_insn_branch = 0;
1000 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1001 if (code == 0x7e)
1002 {
1003 offset = value - (irel->r_offset
1004 + sec->output_section->vma
1005 + sec->output_offset + 1);
1006 offset += bfd_get_16 (abfd, contents + irel->r_offset);
1007
1008 /* If the offset is still out of -128..+127 range,
1009 leave that far branch unchanged. */
1010 if ((offset & 0xff80) == 0 || (offset & 0xff80) == 0xff80)
1011 {
1012
1013 /* Note that we've changed the reldection contents, etc. */
1014 elf_section_data (sec)->relocs = internal_relocs;
1015 free_relocs = NULL;
1016
1017 elf_section_data (sec)->this_hdr.contents = contents;
1018 free_contents = NULL;
1019
1020 symtab_hdr->contents = (bfd_byte *) isymbuf;
1021 free_extsyms = NULL;
1022
1023 /* Shrink the branch. */
1024 code = 0x20;
1025 bfd_put_8 (abfd, code,
1026 contents + irel->r_offset - 1);
1027 bfd_put_8 (abfd, offset,
1028 contents + irel->r_offset);
1029 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1030 R_M68HC11_NONE);
1031 m68hc11_elf_relax_delete_bytes (abfd, sec,
1032 irel->r_offset + 1, 1);
1033 /* That will change things, so, we should relax again. */
1034 *again = TRUE;
1035 }
1036 }
1037 }
1038 prev_insn_branch = 0;
1039 }
1040
1041 if (free_relocs != NULL)
1042 {
1043 free (free_relocs);
1044 free_relocs = NULL;
1045 }
1046
1047 if (free_contents != NULL)
1048 {
1049 if (! link_info->keep_memory)
1050 free (free_contents);
1051 else
1052 {
1053 /* Cache the section contents for elf_link_input_bfd. */
1054 elf_section_data (sec)->this_hdr.contents = contents;
1055 }
1056 free_contents = NULL;
1057 }
1058
1059 if (free_extsyms != NULL)
1060 {
1061 if (! link_info->keep_memory)
1062 free (free_extsyms);
1063 else
1064 {
1065 /* Cache the symbols for elf_link_input_bfd. */
1066 symtab_hdr->contents = (unsigned char *) isymbuf;
1067 }
1068 free_extsyms = NULL;
1069 }
1070
1071 return TRUE;
1072
1073 error_return:
1074 if (free_relocs != NULL)
1075 free (free_relocs);
1076 if (free_contents != NULL)
1077 free (free_contents);
1078 if (free_extsyms != NULL)
1079 free (free_extsyms);
1080 return FALSE;
1081 }
1082
1083 /* Delete some bytes from a section while relaxing. */
1084
1085 static void
1086 m68hc11_elf_relax_delete_bytes (abfd, sec, addr, count)
1087 bfd *abfd;
1088 asection *sec;
1089 bfd_vma addr;
1090 int count;
1091 {
1092 Elf_Internal_Shdr *symtab_hdr;
1093 unsigned int sec_shndx;
1094 bfd_byte *contents;
1095 Elf_Internal_Rela *irel, *irelend;
1096 bfd_vma toaddr;
1097 Elf_Internal_Sym *isymbuf, *isym, *isymend;
1098 struct elf_link_hash_entry **sym_hashes;
1099 struct elf_link_hash_entry **end_hashes;
1100 unsigned int symcount;
1101
1102 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1103 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1104
1105 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1106
1107 contents = elf_section_data (sec)->this_hdr.contents;
1108
1109 toaddr = sec->_cooked_size;
1110
1111 irel = elf_section_data (sec)->relocs;
1112 irelend = irel + sec->reloc_count;
1113
1114 /* Actually delete the bytes. */
1115 memmove (contents + addr, contents + addr + count,
1116 (size_t) (toaddr - addr - count));
1117
1118 sec->_cooked_size -= count;
1119
1120 /* Adjust all the relocs. */
1121 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1122 {
1123 unsigned char code;
1124 unsigned char offset;
1125 unsigned short raddr;
1126 unsigned long old_offset;
1127 int branch_pos;
1128
1129 old_offset = irel->r_offset;
1130
1131 /* See if this reloc was for the bytes we have deleted, in which
1132 case we no longer care about it. Don't delete relocs which
1133 represent addresses, though. */
1134 if (ELF32_R_TYPE (irel->r_info) != R_M68HC11_RL_JUMP
1135 && irel->r_offset >= addr && irel->r_offset < addr + count)
1136 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1137 R_M68HC11_NONE);
1138
1139 if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_NONE)
1140 continue;
1141
1142 /* Get the new reloc address. */
1143 if ((irel->r_offset > addr
1144 && irel->r_offset < toaddr))
1145 irel->r_offset -= count;
1146
1147 /* If this is a PC relative reloc, see if the range it covers
1148 includes the bytes we have deleted. */
1149 switch (ELF32_R_TYPE (irel->r_info))
1150 {
1151 default:
1152 break;
1153
1154 case R_M68HC11_RL_JUMP:
1155 code = bfd_get_8 (abfd, contents + irel->r_offset);
1156 switch (code)
1157 {
1158 /* jsr and jmp instruction are also marked with RL_JUMP
1159 relocs but no adjustment must be made. */
1160 case 0x7e:
1161 case 0x9d:
1162 case 0xbd:
1163 continue;
1164
1165 case 0x12:
1166 case 0x13:
1167 branch_pos = 3;
1168 raddr = 4;
1169
1170 /* Special case when we translate a brclr N,y into brclr *<addr>
1171 In this case, the 0x18 page2 prefix is removed.
1172 The reloc offset is not modified but the instruction
1173 size is reduced by 1. */
1174 if (old_offset == addr)
1175 raddr++;
1176 break;
1177
1178 case 0x1e:
1179 case 0x1f:
1180 branch_pos = 3;
1181 raddr = 4;
1182 break;
1183
1184 case 0x18:
1185 branch_pos = 4;
1186 raddr = 5;
1187 break;
1188
1189 default:
1190 branch_pos = 1;
1191 raddr = 2;
1192 break;
1193 }
1194 offset = bfd_get_8 (abfd, contents + irel->r_offset + branch_pos);
1195 raddr += old_offset;
1196 raddr += ((unsigned short) offset | ((offset & 0x80) ? 0xff00 : 0));
1197 if (irel->r_offset < addr && raddr >= addr)
1198 {
1199 offset -= count;
1200 bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos);
1201 }
1202 else if (irel->r_offset >= addr && raddr <= addr)
1203 {
1204 offset += count;
1205 bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos);
1206 }
1207 else
1208 {
1209 /*printf ("Not adjusted 0x%04x [0x%4x 0x%4x]\n", raddr,
1210 irel->r_offset, addr);*/
1211 }
1212
1213 break;
1214 }
1215 }
1216
1217 /* Adjust the local symbols defined in this section. */
1218 isymend = isymbuf + symtab_hdr->sh_info;
1219 for (isym = isymbuf; isym < isymend; isym++)
1220 {
1221 if (isym->st_shndx == sec_shndx
1222 && isym->st_value > addr
1223 && isym->st_value < toaddr)
1224 isym->st_value -= count;
1225 }
1226
1227 /* Now adjust the global symbols defined in this section. */
1228 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1229 - symtab_hdr->sh_info);
1230 sym_hashes = elf_sym_hashes (abfd);
1231 end_hashes = sym_hashes + symcount;
1232 for (; sym_hashes < end_hashes; sym_hashes++)
1233 {
1234 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1235 if ((sym_hash->root.type == bfd_link_hash_defined
1236 || sym_hash->root.type == bfd_link_hash_defweak)
1237 && sym_hash->root.u.def.section == sec
1238 && sym_hash->root.u.def.value > addr
1239 && sym_hash->root.u.def.value < toaddr)
1240 {
1241 sym_hash->root.u.def.value -= count;
1242 }
1243 }
1244 }
1245
1246 /* Look through the relocs for a section during the first phase.
1247 Since we don't do .gots or .plts, we just need to consider the
1248 virtual table relocs for gc. */
1249
1250 static bfd_boolean
1251 elf32_m68hc11_check_relocs (abfd, info, sec, relocs)
1252 bfd * abfd;
1253 struct bfd_link_info * info;
1254 asection * sec;
1255 const Elf_Internal_Rela * relocs;
1256 {
1257 Elf_Internal_Shdr * symtab_hdr;
1258 struct elf_link_hash_entry ** sym_hashes;
1259 struct elf_link_hash_entry ** sym_hashes_end;
1260 const Elf_Internal_Rela * rel;
1261 const Elf_Internal_Rela * rel_end;
1262
1263 if (info->relocateable)
1264 return TRUE;
1265
1266 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
1267 sym_hashes = elf_sym_hashes (abfd);
1268 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
1269 if (!elf_bad_symtab (abfd))
1270 sym_hashes_end -= symtab_hdr->sh_info;
1271
1272 rel_end = relocs + sec->reloc_count;
1273
1274 for (rel = relocs; rel < rel_end; rel++)
1275 {
1276 struct elf_link_hash_entry * h;
1277 unsigned long r_symndx;
1278
1279 r_symndx = ELF32_R_SYM (rel->r_info);
1280
1281 if (r_symndx < symtab_hdr->sh_info)
1282 h = NULL;
1283 else
1284 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
1285
1286 switch (ELF32_R_TYPE (rel->r_info))
1287 {
1288 /* This relocation describes the C++ object vtable hierarchy.
1289 Reconstruct it for later use during GC. */
1290 case R_M68HC11_GNU_VTINHERIT:
1291 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1292 return FALSE;
1293 break;
1294
1295 /* This relocation describes which C++ vtable entries are actually
1296 used. Record for later use during GC. */
1297 case R_M68HC11_GNU_VTENTRY:
1298 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1299 return FALSE;
1300 break;
1301 }
1302 }
1303
1304 return TRUE;
1305 }
1306
1307 /* Relocate a 68hc11/68hc12 ELF section. */
1308 static bfd_boolean
1309 elf32_m68hc11_relocate_section (output_bfd, info, input_bfd, input_section,
1310 contents, relocs, local_syms, local_sections)
1311 bfd *output_bfd ATTRIBUTE_UNUSED;
1312 struct bfd_link_info *info;
1313 bfd *input_bfd;
1314 asection *input_section;
1315 bfd_byte *contents;
1316 Elf_Internal_Rela *relocs;
1317 Elf_Internal_Sym *local_syms;
1318 asection **local_sections;
1319 {
1320 Elf_Internal_Shdr *symtab_hdr;
1321 struct elf_link_hash_entry **sym_hashes;
1322 Elf_Internal_Rela *rel, *relend;
1323 const char *name;
1324
1325 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1326 sym_hashes = elf_sym_hashes (input_bfd);
1327
1328 rel = relocs;
1329 relend = relocs + input_section->reloc_count;
1330 for (; rel < relend; rel++)
1331 {
1332 int r_type;
1333 reloc_howto_type *howto;
1334 unsigned long r_symndx;
1335 Elf_Internal_Sym *sym;
1336 asection *sec;
1337 struct elf_link_hash_entry *h;
1338 bfd_vma relocation;
1339 bfd_reloc_status_type r;
1340
1341 r_symndx = ELF32_R_SYM (rel->r_info);
1342 r_type = ELF32_R_TYPE (rel->r_info);
1343
1344 if (r_type == R_M68HC11_GNU_VTENTRY
1345 || r_type == R_M68HC11_GNU_VTINHERIT )
1346 continue;
1347
1348 howto = elf_m68hc11_howto_table + r_type;
1349
1350 if (info->relocateable)
1351 {
1352 /* This is a relocateable link. We don't have to change
1353 anything, unless the reloc is against a section symbol,
1354 in which case we have to adjust according to where the
1355 section symbol winds up in the output section. */
1356 if (r_symndx < symtab_hdr->sh_info)
1357 {
1358 sym = local_syms + r_symndx;
1359 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1360 {
1361 sec = local_sections[r_symndx];
1362 rel->r_addend += sec->output_offset + sym->st_value;
1363 }
1364 }
1365
1366 continue;
1367 }
1368
1369 /* This is a final link. */
1370 h = NULL;
1371 sym = NULL;
1372 sec = NULL;
1373 if (r_symndx < symtab_hdr->sh_info)
1374 {
1375 sym = local_syms + r_symndx;
1376 sec = local_sections[r_symndx];
1377 relocation = (sec->output_section->vma
1378 + sec->output_offset
1379 + sym->st_value);
1380 }
1381 else
1382 {
1383 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1384 while (h->root.type == bfd_link_hash_indirect
1385 || h->root.type == bfd_link_hash_warning)
1386 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1387 if (h->root.type == bfd_link_hash_defined
1388 || h->root.type == bfd_link_hash_defweak)
1389 {
1390 sec = h->root.u.def.section;
1391 relocation = (h->root.u.def.value
1392 + sec->output_section->vma
1393 + sec->output_offset);
1394 }
1395 else if (h->root.type == bfd_link_hash_undefweak)
1396 relocation = 0;
1397 else
1398 {
1399 if (!((*info->callbacks->undefined_symbol)
1400 (info, h->root.root.string, input_bfd,
1401 input_section, rel->r_offset, TRUE)))
1402 return FALSE;
1403 relocation = 0;
1404 }
1405 }
1406
1407 if (h != NULL)
1408 name = h->root.root.string;
1409 else
1410 {
1411 name = (bfd_elf_string_from_elf_section
1412 (input_bfd, symtab_hdr->sh_link, sym->st_name));
1413 if (name == NULL || *name == '\0')
1414 name = bfd_section_name (input_bfd, sec);
1415 }
1416
1417 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1418 contents, rel->r_offset,
1419 relocation, rel->r_addend);
1420
1421 if (r != bfd_reloc_ok)
1422 {
1423 const char * msg = (const char *) 0;
1424
1425 switch (r)
1426 {
1427 case bfd_reloc_overflow:
1428 if (!((*info->callbacks->reloc_overflow)
1429 (info, name, howto->name, (bfd_vma) 0,
1430 input_bfd, input_section, rel->r_offset)))
1431 return FALSE;
1432 break;
1433
1434 case bfd_reloc_undefined:
1435 if (!((*info->callbacks->undefined_symbol)
1436 (info, name, input_bfd, input_section,
1437 rel->r_offset, TRUE)))
1438 return FALSE;
1439 break;
1440
1441 case bfd_reloc_outofrange:
1442 msg = _ ("internal error: out of range error");
1443 goto common_error;
1444
1445 case bfd_reloc_notsupported:
1446 msg = _ ("internal error: unsupported relocation error");
1447 goto common_error;
1448
1449 case bfd_reloc_dangerous:
1450 msg = _ ("internal error: dangerous error");
1451 goto common_error;
1452
1453 default:
1454 msg = _ ("internal error: unknown error");
1455 /* fall through */
1456
1457 common_error:
1458 if (!((*info->callbacks->warning)
1459 (info, msg, name, input_bfd, input_section,
1460 rel->r_offset)))
1461 return FALSE;
1462 break;
1463 }
1464 }
1465 }
1466
1467 return TRUE;
1468 }
1469
1470
1471 \f
1472 /* Set and control ELF flags in ELF header. */
1473
1474 bfd_boolean
1475 _bfd_m68hc11_elf_set_private_flags (abfd, flags)
1476 bfd *abfd;
1477 flagword flags;
1478 {
1479 BFD_ASSERT (!elf_flags_init (abfd)
1480 || elf_elfheader (abfd)->e_flags == flags);
1481
1482 elf_elfheader (abfd)->e_flags = flags;
1483 elf_flags_init (abfd) = TRUE;
1484 return TRUE;
1485 }
1486
1487 /* Merge backend specific data from an object file to the output
1488 object file when linking. */
1489
1490 bfd_boolean
1491 _bfd_m68hc11_elf_merge_private_bfd_data (ibfd, obfd)
1492 bfd *ibfd;
1493 bfd *obfd;
1494 {
1495 flagword old_flags;
1496 flagword new_flags;
1497 bfd_boolean ok = TRUE;
1498
1499 /* Check if we have the same endianess */
1500 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
1501 return FALSE;
1502
1503 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1504 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1505 return TRUE;
1506
1507 new_flags = elf_elfheader (ibfd)->e_flags;
1508 elf_elfheader (obfd)->e_flags |= new_flags & EF_M68HC11_ABI;
1509 old_flags = elf_elfheader (obfd)->e_flags;
1510
1511 if (! elf_flags_init (obfd))
1512 {
1513 elf_flags_init (obfd) = TRUE;
1514 elf_elfheader (obfd)->e_flags = new_flags;
1515 elf_elfheader (obfd)->e_ident[EI_CLASS]
1516 = elf_elfheader (ibfd)->e_ident[EI_CLASS];
1517
1518 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
1519 && bfd_get_arch_info (obfd)->the_default)
1520 {
1521 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
1522 bfd_get_mach (ibfd)))
1523 return FALSE;
1524 }
1525
1526 return TRUE;
1527 }
1528
1529 /* Check ABI compatibility. */
1530 if ((new_flags & E_M68HC11_I32) != (old_flags & E_M68HC11_I32))
1531 {
1532 (*_bfd_error_handler)
1533 (_("%s: linking files compiled for 16-bit integers (-mshort) "
1534 "and others for 32-bit integers"),
1535 bfd_archive_filename (ibfd));
1536 ok = FALSE;
1537 }
1538 if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64))
1539 {
1540 (*_bfd_error_handler)
1541 (_("%s: linking files compiled for 32-bit double (-fshort-double) "
1542 "and others for 64-bit double"),
1543 bfd_archive_filename (ibfd));
1544 ok = FALSE;
1545 }
1546 new_flags &= ~EF_M68HC11_ABI;
1547 old_flags &= ~EF_M68HC11_ABI;
1548
1549 /* Warn about any other mismatches */
1550 if (new_flags != old_flags)
1551 {
1552 (*_bfd_error_handler)
1553 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
1554 bfd_archive_filename (ibfd), (unsigned long) new_flags,
1555 (unsigned long) old_flags);
1556 ok = FALSE;
1557 }
1558
1559 if (! ok)
1560 {
1561 bfd_set_error (bfd_error_bad_value);
1562 return FALSE;
1563 }
1564
1565 return TRUE;
1566 }
1567
1568 bfd_boolean
1569 _bfd_m68hc11_elf_print_private_bfd_data (abfd, ptr)
1570 bfd *abfd;
1571 PTR ptr;
1572 {
1573 FILE *file = (FILE *) ptr;
1574
1575 BFD_ASSERT (abfd != NULL && ptr != NULL);
1576
1577 /* Print normal ELF private data. */
1578 _bfd_elf_print_private_bfd_data (abfd, ptr);
1579
1580 /* xgettext:c-format */
1581 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
1582
1583 if (elf_elfheader (abfd)->e_flags & E_M68HC11_I32)
1584 fprintf (file, _("[abi=32-bit int,"));
1585 else
1586 fprintf (file, _("[abi=16-bit int,"));
1587
1588 if (elf_elfheader (abfd)->e_flags & E_M68HC11_F64)
1589 fprintf (file, _(" 64-bit double]"));
1590 else
1591 fprintf (file, _(" 32-bit double]"));
1592
1593 if (elf_elfheader (abfd)->e_flags & E_M68HC12_BANKS)
1594 fprintf (file, _(" [memory=bank-model]"));
1595 else
1596 fprintf (file, _(" [memory=flat]"));
1597
1598 fputc ('\n', file);
1599
1600 return TRUE;
1601 }
1602
1603 /* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c.
1604 The Motorola spec says to use a different Elf machine code. */
1605 #define ELF_ARCH bfd_arch_m68hc11
1606 #define ELF_MACHINE_CODE EM_68HC11
1607 #define ELF_MAXPAGESIZE 0x1000
1608
1609 #define TARGET_BIG_SYM bfd_elf32_m68hc11_vec
1610 #define TARGET_BIG_NAME "elf32-m68hc11"
1611
1612 #define elf_info_to_howto 0
1613 #define elf_info_to_howto_rel m68hc11_info_to_howto_rel
1614 #define bfd_elf32_bfd_relax_section m68hc11_elf_relax_section
1615 #define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook
1616 #define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook
1617 #define elf_backend_check_relocs elf32_m68hc11_check_relocs
1618 #define elf_backend_relocate_section elf32_m68hc11_relocate_section
1619 #define elf_backend_object_p 0
1620 #define elf_backend_final_write_processing 0
1621 #define elf_backend_can_gc_sections 1
1622 #define bfd_elf32_bfd_merge_private_bfd_data \
1623 _bfd_m68hc11_elf_merge_private_bfd_data
1624 #define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
1625 #define bfd_elf32_bfd_print_private_bfd_data \
1626 _bfd_m68hc11_elf_print_private_bfd_data
1627
1628 #include "elf32-target.h"
GDB Binutils - Deliverables
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